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Merge pull request #80591 from danwinship/no-localhost-snat

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hostport: Don't masquerade localhost-to-localhost traffic
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Kubernetes Prow Robot 2019-07-31 22:36:50 -07:00 committed by GitHub
commit 0775e6b2db
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2 changed files with 7 additions and 5 deletions
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10
pkg/kubelet/dockershim/network/hostport/hostport.go
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@ -134,10 +134,12 @@ func ensureKubeHostportChains(iptables utiliptables.Interface, natInterfaceName
return fmt.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", tc.table, tc.chain, kubeHostportsChain, err) return fmt.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", tc.table, tc.chain, kubeHostportsChain, err)
} }
} }
// Need to SNAT traffic from localhost if natInterfaceName != "" && natInterfaceName != "lo" {
args = []string{"-m", "comment", "--comment", "SNAT for localhost access to hostports", "-o", natInterfaceName, "-s", "127.0.0.0/8", "-j", "MASQUERADE"} // Need to SNAT traffic from localhost
if _, err := iptables.EnsureRule(utiliptables.Append, utiliptables.TableNAT, utiliptables.ChainPostrouting, args...); err != nil { args = []string{"-m", "comment", "--comment", "SNAT for localhost access to hostports", "-o", natInterfaceName, "-s", "127.0.0.0/8", "-j", "MASQUERADE"}
return fmt.Errorf("Failed to ensure that %s chain %s jumps to MASQUERADE: %v", utiliptables.TableNAT, utiliptables.ChainPostrouting, err) if _, err := iptables.EnsureRule(utiliptables.Append, utiliptables.TableNAT, utiliptables.ChainPostrouting, args...); err != nil {
return fmt.Errorf("Failed to ensure that %s chain %s jumps to MASQUERADE: %v", utiliptables.TableNAT, utiliptables.ChainPostrouting, err)
}
} }
return nil return nil
} }

2
pkg/kubelet/dockershim/network/hostport/hostport_manager.go
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@ -40,7 +40,7 @@ type HostPortManager interface {
// Add implements port mappings. // Add implements port mappings.
// id should be a unique identifier for a pod, e.g. podSandboxID. // id should be a unique identifier for a pod, e.g. podSandboxID.
// podPortMapping is the associated port mapping information for the pod. // podPortMapping is the associated port mapping information for the pod.
// natInterfaceName is the interface that localhost used to talk to the given pod. // natInterfaceName is the interface that localhost uses to talk to the given pod, if known.
Add(id string, podPortMapping *PodPortMapping, natInterfaceName string) error Add(id string, podPortMapping *PodPortMapping, natInterfaceName string) error
// Remove cleans up matching port mappings // Remove cleans up matching port mappings
// Remove must be able to clean up port mappings without pod IP // Remove must be able to clean up port mappings without pod IP